My brother in law has a Big E in his basement. The flame is sort of lazy and he gets a ton of ash build up on either side of the burn pot, to the point where it will eventually not make it out of the pot and smother the fire. If I pull the damper all the way out, it barely moves the pellets around. My big E, will blow the fire out with the damper all the way out even on the highest setting. He runs his stove on the middle setting. His stove has run like this since new. He used to have it in his garage with no OAK. We installed it in his basement with an OAK. The only difference now is no creosote, which I attribute to the OAK. So far..... I've tried a different control board to see if the combustion blower wasn't getting enough voltage. With the stove running, I have 120 volts to the blower. I removed the combustion blower and it's as clean as a wistle. The combustion blower runs quiet. There was no build up in or around where the blower goes, and no restrictions. The blower looked like it came out of stove that burnt maybe 2 bags. I removed the ash doors inside the stove, and there was almost no ash back there. He had never cleaned behind there since he got it. I have to clean behind mine once every two weeks. I checked the gaskets on the ash pan and door with a candle lighter, and found no change in the flame. The burn pot has a tight seal around it, so I don't believe there is any air loss there. The stack is clean. We cleaned it before installing it in the basement, and I gave it a good once over while I was testing everything. It's feeding pellets just fine. It's a lack of air issue if anything. Anyone have any ideas?